Heater housing



FIG. 1 is a top perspective view of a heater housing showing our new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a top elevation view thereof;

FIG. 4 is a right side elevation view thereof; the left side being a mirror image; and,

FIG. 5 is a back elevation view thereof. 

The ornamental design for a heater housing, as shown and described. 